The Olympics was postponed to this July and Johnson won last year's FedEx Cup playoff crown to achieve that career goal.
Sergio Garcia rushed to the first tee and raced to the finish line Thursday in The Players Championship.
Dustin Johnson pips Justin Rose and Tony Finau to ease to second Saudi International title in three years
The Saudi International is the last of three events in the “Gulf Swing” that launches 2021 on the European Tour.
A two-putt birdie on the par-5 18th tied Justin Thomas with English, whose 65 was highlighted by pitching in for eagle on No. 9.
Even a year shortened by the COVID-19 pandemic — Johnson missed two tournaments when he tested positive — he was so good over the last five months that he ended the year with the biggest margin at No. 1 in the world in six years.
A big drive gave Collin Morikawa his first major. A big putt gave Viktor Hovland his first win. And a big iron — in Bryson DeChambeau's case, a really big iron — allowed players to consider an unconventional approach to the game.
Tournament organizers said on Thursday that seven members of Europe's last Ryder Cup team will play the Saudi International on 4-7 February, the same week as the Phoenix Open on the PGA Tour.
No one in Masters history was better as Johnson, whose other major victory came at the 2016 US Open, fired a four-under-par 68 to finish on a Masters record 20-under-par 268.
He added tap-in birdies at the par-4 seventh, par-5 13th and par-5 15th to equal the 54-hole mark set in 2015 by Jordan Speith.
Masters 2020: World No 1 Dustin Johnson shares four-way second-round clubhouse lead at nine under par
Germany's 63-year-old Bernhard Langer became the oldest player to make the cut in Masters history on 141. An expected 1-under cut line would be the lowest in Masters history.
Paul Casey matched his lowest score at the Masters with a 7-under 65, giving him a two-shot lead among half the field fortunate to play in perfect scoring conditions.
In a video tweeted by The Masters, the Spanish golfer is seen lining up his shot and smacking a laser of shot skimming across the water.
Ortiz holed two long birdie putts from off the green to take the lead, then was rock solid down the stretch and delivered the winning shots for a 5-under 65 and a two-shot victory in the Houston Open.
Dustin Johnson still 'low on energy', pulls out of second straight golf tournament after testing COVID-19 positive
Dustin Johnson, 36, is recovering after experiencing some Covid-19 symptoms but is still not well enough to resume playing competitive golf, his agent David Winkle said.
Johnson underwent a test after experiencing symptoms of coronavirus ahead of Thursday's opening round at Shadow Creek, the tour said in a statement.
PGA Tour Championship: World No 1 Dustin Johnson claims three-shot victory to clinch FedEx Cup, $15 million prize
Dustin Johnson became the first No 1 seed at the Tour Championship to win the FedEx Cup since Tiger Woods in 2009.
PGA Tour Championship: Dustin Johnson rediscovers driving form to seize five-stroke lead after third round
The 36-year-old American is chasing his first PGA playoff crown and third victory since the tour returned from a three-month coronavirus shutdown in June, standing on 19-under after 54 holes at East Lake in Atlanta.
Rahm won for the second time this year, and for the 11th time worldwide in his four years as a pro. His first win came at Torrey Pines when he made a 60-foot eagle putt and wound up winning by three.
Dustin Johnson finished with a 30-under par total of 254 at TPC Boston, with Harris English a distant second on 265 after a closing 69.
Johnson was among eight players who had at least a share of the lead at some point Saturday, a wild third round of low scores, long putts and endless possibilities.